(ˌtɛtrəˈzəʊlɪəm) n (Chemistry) a derivative of an acidic chemical compound
tetrazolium
tet·ra·zo·li·um
(tet'ră-zō'lē-ŭm), Any of a group of organic salts having the general structure that on reduction (cleaving the 2,3 bond) yields a colored insoluble formazan; used as a reagent in oxidative enzyme histochemistry.